京蒙沙源区水库大气氮沉降变化特征及源解析

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Abstract Taking Dahekou reservoir in the sand source areas of Beijing and Inner Mongolia as research area. From January to December 2017, 144 samples were collected from 12 atmospheric deposition monitoring sites along the reservoir shore to determine the concentration of total nitrogen (TN) in dry and wet deposition. Then the dry and wet deposition fluxes of TN were calculated and the pollution characteristics and seasonal variation characteristics were analyzed. A total of 76 soil samples and 14 sampling points were collected from different typical plots around the reservoir. In addition, the soil δ¹⁵N-TN content level was measured and the main sources of atmospheric nitrogen deposition were analyzed. Furthermore, based on HYSPLIT4 air mass backward trajectory model, the influence of different types of air mass on Dahekou Reservoir was analyzed. The results show that the annual variation of atmospheric TN dry deposition flux in the reservoir ranged from 122.44 to 425.64kg/(km²·month), with an average value of 200.83kg/(km²·month); the wet deposition flux varied from 1.23 to 188.89kg/(km²·month), with an average value of 66.33kg/(km²·month); the annual average nitrogen deposition was 3205.9kg/(km²·a), which was about 4.06 times of the national average level of nitrogen deposition (790kg/(km²·a)). In terms of sedimentary types, dry deposition accounts for 75.17% of total deposition and wet deposition accounted for 24.83% of total deposition. Atmospheric nitrogen dry deposition fluxes were significantly higher in spring and autumn than summer and winter, and wet deposition fluxes in spring and summer were significantly higher than that of autumn and winter. Typical plots of δ¹⁵N-TN data analysis showed that 71.4% of the atmospheric deposition samples in summer came from unresolved mixed source inputs, and more than 45% of the samples from Dahekou Reservoir in spring, autumn and winter come from sandy land, the major source of pollution was the cultivated land around the study area. Using the HYSPLIT4backward trajectory model, it was proved that Mongolia's air mass entering into the study area had a greater impact on the atmospheric transport of pollutants. The air pollution during heating period of winter and frequent dust storms in spring were one of the factors leading to the deterioration of the spring water environment in the northern sand area.

Key words： Dahekou reservoir sand source areas deposition fluxes source analysis nitrogen

Received: 26 July 2020

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	LU Jun-ping
	ZHANG Xiao-jing
	LIU Ting-xi
	ZHANG Wen-rui
	LIU Yu

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LU Jun-ping,ZHANG Xiao-jing,LIU Ting-xi等. Variation characteristics and source analysis of atmospheric nitrogen deposition flux on a reservoir in sand source areas of Beijing-Inner Mongolia[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1034-1044.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1034

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